Band sawing-machine



(-No Model.)

P. MILLER.

BAND SAWING MAGHINB.

Patented Nov. 18, 1884..

Pitre/NT QEFICE.

- UNIIED STATES PHILIP MILLER, F NORICH, CONNECTICUT.

BAND SAWlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 308,188, dted November 18, 1884. i nnlicnwlsp'tggber so, recrea-sommeil) .T0 all whom t may con/cern,.-

Be it known that I, PHILIP MILLER, of the city of Norwich, county of New London, and State of Connecticut, have invented certain new and useful Improvements in Devices for Sawing Logs and Felling Trees, which improvements are fully set forth and described in the following specification, reference being had to the accompanying drawings.

My improvement relates to. a mechanical device for sawing logs into desired lengths, or for sawing off standing trees, my object beingto provide a device which is portable, convenient to use, and which shall cut more rapidly than saws now in common use.

Said invention consists, first, of a portable saw-frame for band-saws, and a peculiar means for securing the same to a log or tree; second, of perforating said saw and providing lugs-to 2o engage said perfor-ations on the pulleys around which the saw travels, to keep the saw moving continually in the same plane, and to prevent all tendency ou the part of the saw to slip when in use; third, of forming the lower portion of the supporting-frame so it will clasp the back or upper edge of the saw to prevent spreading; fourth, of guide-rolls to hold the two cutting-sections in close engagement with each other when sawing a single kerf, or to 3o regulate the length of the piece sawed on when sawing a double korf; fifth, of means for transmitting motion and power from one pulley to its mate at the opposite end of the supporting-frame; sixth, ot' a suitable handle by 3 5 which said frame may be elevated or depressed by the operator in charge; and, seventh, of a peculiar form of saw-tooth.

In the annexed drawings, Figure 1 is a side elevation of my complete device, the same be- 40 ing secured to a fallen log. Fig. 2 is a top view of the same with the supporting-frame removed. Fig. iis a cross-section 011 line x fr, Fig. 1, showing the form of the lower edge of vthe frame A. Fig. 4 is an enlarged edgewise .45 View of the saw-teeth; and Fig. 5 is an enlarged cross-section similar to Fig. 3, showing the relative length of the inner and outer teeth. The top and sides of my supporting-frame .Amay be of wood or iron, as desired; but the 5o lower rail, A', and stiifening-brace A2, if used, should be of a thickness equal to the united *xthickness of the two contiguous sect-ions of the saw-blade, for reasons hereinafter specified. At each lower corner of the supportingframe is secured a frame, I5 B', having bearings in which rotate the shafts C C', carrying with them pulleys E E. These pulleys support the band-saw G, which, as above stated, is provided at regular distances with slots a, which engage lugs b on pulleys E E', the ofiice of said lugs being to keep the saw in a given position and prevent its slipping on said pulleys. The frame B has secured toits lower portion a shaft, c, which is journaled in the outer ends of two or more dogs or clamps, I. When said clamps are secured rigidly to a log or tree, as shown, the shaft c lforms the hinge or pivot on which the saw and its several frames-and pulleys may be swung, the move ment of the same being easily controlled by the handle d on the freeor movableend of the frame A. These clamps I may be located one on` each side of the pulley-frame, as shown, or maybe both on t-he same side, in which ease the pulley-frame is supported on the outer free end ot' shaft c.

Formed as a part of frames B B are inward extensions or arms, e e', furnishing bearings for the pivots of pulleys h h. These pulleys h h are preferably so located relative tothe saw that the two sections of said sawafter passing, around the pulleys E E', are brought in contact with each other, traveling, of course, in opposite, directions, but cutting a single -kerf. Byvso ruiming the two cutting-sectionsl of the saw in the same kerf I find that said saw cuts much Inore rapidly than a singlesawblade and clears itself much better.

As a convenient and inexpensive way to apply power to my device I have formed pulley E with a grooved ilange at its upper end, in which groove runs a rope or belt, K, which is kept in motion by a steam-engine located at a suitable distance from the saw', orbyany other convenient power. W'

In cases where it is desirable to transmit power and motion from pulley Bto pulley E', so that both sides of the saw Inay travel alike, I have arranged the system of shafts C C and i, and the limiter-gears k k, which will be readily lunderstood from the drawings,` the general arrangement being almost identical with the vertical feed in a metal-planer.

4 It will be evident that ifthe twoenttngsections of the saw are not held in close en gti-gement with each other there will be a constant inclination to spread and leave each 'other with a tendency to. cramp and break said saw, especially so it' sawdust is allowed to work upward between the two moving sect-ions. To anticipate und overcome this difficulty I have grooved the lower edge of frame A', and formed the upper edge of the saw s'o that said groovcd frame rests on and holds together both of said Saw-sections, as shown in Figs. 3 and 5. In Fig. 5 is also shown a parting-strip, n, formed as a partof frame A', which keeps the saw-blades slight-ly apart, prevent-- ing unnecessary friction. In many cases, atter a tree has been felled, it is necessary that the log should be ent up into cord-wood or other sections of regular length. By moving the guide-pulleys hh apart, as indicated by dotted circles in Fig. 2, the saw-blades are separated from yeach other, each making its own kerf, instead of running in a single kerl'. as above described. Thus it will be seen that at every complete cutting of the saw twolengths or sections of the log are eut o. The teeth of my saw are formed, preferably, as in Figs. 4 and 5-that is to say, they are so tiled that as the teeth on the engaging-surfaces pesseach other they make a shearingfcut, also tend to 'throw all sawdust outward instead of between and having its upper edge shaped to conform 4 to thegroove in section A. and the guide-rolls vh h', so located that they hold the inner faces of the'band-saw in engagement with each other, all being combined and used substantially as and for the purpose specified.

l PHILIP MILLER.

Witnesses:

FRANK H. ALLEN, TYLER J. HOWARD. 

